I'm thinking of giving myo-reps a try for dumbbell shrugs, but my gym doesn't have heavy dumbbells. I can do 20 reps to failure of the heaviest ones at the moment. Would this be too light for the activation set for shrugs?(it's the upper limit of the range recommended in the article but you do mention you sometimes go higher, don't know in which exercises though) Should the mini-sets also be a bit longer than 1-5 reps?

When the article says different muscles require different rest periods/number of myo-reps, what sort of range are we aiming for? Obviously if you're always doing a ton of mini-sets then reducing rest/increasing reps is a given, but is there roughly an optimum range to aim for? e.g. a combination that lets us get 2 mini-sets on a bad day - 5 sets on a good day? Something like that?